U.S.S. Enterprise is
thrown into a time warp by a black star, it ends up orbiting Earth in
the 20th century. Omaha Air Base detects a peculiar UFO and sends a
fighter plane, manned by Captain John Christopher, to investigate.
The starship accidentally destroys the plane, caught in their tractor
so the pilot is beamed aboard. The problem now, of course, is to
prevent Captain Christopher from returning to tell others on Earth. In
order not to change history, in which Christopher's son will prove
important, Kirk must return the captain to Earth without knowledge of
In an attempt to remove all records of the U.S.S. Enterprise
Kirk and Sulu beam down to the air base. Kirk is almost immediately
captured by the Air Police, though Sulu manages to escape and gets the
stolen records to the U.S.S. Enterprise. Spock and Captain Christopher
beam down to help get Kirk away from the Air Police. At the same time,
an Air Police sergeant has been accidentally caught in the U.S.S.
Enterprise's transporter beam and is reeling as he finds himself on a
and Scotty manage to recreate the conditions of the time warp that
brought them to this time, with a slingshot effect around the Sun. The
confused Air Police sergeant is returned to Earth a second before he
was transported to the Enterprise, so he will remember nothing of his
astounding experience, and the starship returns to the 23rd century.
This time, the pilot sees
nothing and the Air Force concludes that the sighting was a mistake ...
a UFO. In effect, everything that had happened, never happened.